Google Listings plugin unable to connect 2nd times to my Google Merchant Account

Hello,
I installed the Google Listings & Ads plugin
The first time everything worked fine.
I managed to send a list to my Google Merchant account but there was some data missing for each products.
https://snipboard.io/3IGp8W.jpg
I deleted the Google Listings & Ads plugin and deleted the imported products in my Google Merchant account : https://snipboard.io/TsZ4Mo.jpg

Then I downloaded CTX Feed and Tatvic EE Plugin tried them and deleted both plugins.

Then I reinstalled the Google Listings & Ads plugin.
But now the plugin can’t connect to my Google Merchant account as you can see in this images (Connection impossible) : https://snipboard.io/Men1yP.jpg

Strangely I can see the 1st list uploaded in Google Listings & Ads plugin but it is now unable to connect to my Google Merchant account…
Apparently the plugin kept in memory the past actions (1st upload of product list)… ?

What can I do… ?
Thank you in advance for your answer !