There was a problem while sending the test email

Hi I have successfully set up the plugin connecting it to a gmail account, but I still get an error when trying to send the test email.

Below is the full error log;

Versions:
WordPress: 5.0.3
WordPress MS: No
PHP: 7.2.14
WP Mail SMTP: 1.4.1

Params:
Mailer: gmail
Constants: No
Client ID/Secret: Yes
Auth Code: Yes
Access Token: Yes

Server:
OpenSSL: OpenSSL 1.0.1e 11 Feb 2013
PHP.allow_url_fopen: Yes
PHP.stream_socket_client(): Yes
PHP.fsockopen(): Yes
PHP.curl_version(): 7.19.7

Debug:
Mailer: Gmail
{
“error”: {
“errors”: [
{
“domain”: “global”,
“reason”: “failedPrecondition”,
“message”: “Bad Request”
}
],
“code”: 400,
“message”: “Bad Request”
}
}