Error connecting main site to subdomain

Hey,
I have a multisite setup. I am trying to connect sitea.com to sub.sitea.com. But none of the test are getting cleared. I have tried numerous tutorials but all in vain. The activity logs are below:

2022-05-20 12:34:41 - Info - Renewing token for https://mods.mss.com
2022-05-20 12:34:42 - Warning - Failed to renew token for https://mods.mss.com - retrying...
2022-05-20 12:34:42 - Alert - Failed to renew token for https://mods.mss.com
2022-05-20 12:34:42 - Info - Response data received from the remote site:
		Array
(
    [0] => Array
        (
            [headers] => Array
                (
                    [date] => Fri, 20 May 2022 12:34:42 GMT
                    [server] => Apache
                    [upgrade] => h2,h2c
                    [cache-control] => max-age=600
                    [expires] => Fri, 20 May 2022 12:44:42 GMT
                    [vary] => User-Agent
                    [content-length] => 0
                    [content-type] => text/html; charset=UTF-8
                )

            [response_code] => 200
            [response_message] => OK
            [body] => 
        )

)
	
2022-05-20 12:34:42 - Alert - Failed to renew token for https://mods.mss.com
2022-05-20 12:34:42 - Info - Response data received from the remote site:
		Array
(
    [0] => Array
        (
            [headers] => Array
                (
                    [date] => Fri, 20 May 2022 12:34:41 GMT
                    [server] => Apache
                    [upgrade] => h2,h2c
                    [cache-control] => max-age=600
                    [expires] => Fri, 20 May 2022 12:44:41 GMT
                    [vary] => User-Agent
                    [content-length] => 0
                    [content-type] => text/html; charset=UTF-8
                )

            [response_code] => 200
            [response_message] => OK
            [body] => 
        )

)
	
2022-05-20 12:34:43 - Alert - The remote website encountered the following error: Unauthorized access (invalid token) - https://mss.com
2022-05-20 12:34:43 - Info - Response data received from the remote site:
		Array
(
    [0] => Array
        (
            [headers] => Array
                (
                    [date] => Fri, 20 May 2022 12:34:42 GMT
                    [server] => Apache
                    [upgrade] => h2,h2c
                    [cache-control] => max-age=172800
                    [expires] => Sun, 22 May 2022 12:34:42 GMT
                    [vary] => Accept-Encoding,User-Agent
                    [content-encoding] => gzip
                    [content-length] => 137
                    [content-type] => application/json; charset=UTF-8
                )

            [response_code] => 200
            [response_message] => OK
            [body] => {"success":false,"data":"The remote website encountered the following error: Unauthorized access (invalid token) - https:\/\/mss.com"}
        )

)
	
2022-05-20 12:34:52 - Info - Renewing token for https://mods.mss.com
2022-05-20 12:34:52 - Warning - Failed to renew token for https://mods.mss.com - retrying...
2022-05-20 12:34:53 - Alert - Failed to renew token for https://mods.mss.com
2022-05-20 12:34:53 - Info - Response data received from the remote site:
		Array
(
    [0] => Array
        (
            [headers] => Array
                (
                    [date] => Fri, 20 May 2022 12:34:52 GMT
                    [server] => Apache
                    [upgrade] => h2,h2c
                    [cache-control] => max-age=600
                    [expires] => Fri, 20 May 2022 12:44:52 GMT
                    [vary] => User-Agent
                    [content-length] => 0
                    [content-type] => text/html; charset=UTF-8
                )

            [response_code] => 200
            [response_message] => OK
            [body] => 
        )

)
	
2022-05-20 12:34:53 - Alert - Failed to renew token for https://mods.mss.com
2022-05-20 12:34:53 - Info - Response data received from the remote site:
		Array
(
    [0] => Array
        (
            [headers] => Array
                (
                    [date] => Fri, 20 May 2022 12:34:52 GMT
                    [server] => Apache
                    [upgrade] => h2,h2c
                    [cache-control] => max-age=600
                    [expires] => Fri, 20 May 2022 12:44:52 GMT
                    [vary] => User-Agent
                    [content-length] => 0
                    [content-type] => text/html; charset=UTF-8
                )

            [response_code] => 200
            [response_message] => OK
            [body] => 
        )

)
	
2022-05-20 12:34:54 - Alert - The remote website encountered the following error: Unauthorized access (invalid token) - https://mss.com
2022-05-20 12:34:54 - Info - Response data received from the remote site:
		Array
(
    [0] => Array
        (
            [headers] => Array
                (
                    [date] => Fri, 20 May 2022 12:34:53 GMT
                    [server] => Apache
                    [upgrade] => h2,h2c
                    [cache-control] => max-age=172800
                    [expires] => Sun, 22 May 2022 12:34:53 GMT
                    [vary] => Accept-Encoding,User-Agent
                    [content-encoding] => gzip
                    [content-length] => 137
                    [content-type] => application/json; charset=UTF-8
                )

            [response_code] => 200
            [response_message] => OK
            [body] => {"success":false,"data":"The remote website encountered the following error: Unauthorized access (invalid token) - https:\/\/mss.com"}
        )

)