Hi, I'm having this same problem, was a solution ever found?
The STAT command did not succeed. Error getting message number and sizes. Mail server pop.gmail.com responded: [AUTH] Invalid credentials.
Soluzione scelta
Disregard.
I had only deleted two of three password entries in the security and passwords section. After deleting the OAUTH password, it let me enter my password again but it wouldn't accept the new password I created just a week ago, despite it telling me I had changed it 6 days ago. So, I changed my password, AGAIN, and now it's working again.
Not at all a simple or smooth process and I used to build my own PCs so I do know a thing or two about computers.
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Soluzione scelta
Disregard.
I had only deleted two of three password entries in the security and passwords section. After deleting the OAUTH password, it let me enter my password again but it wouldn't accept the new password I created just a week ago, despite it telling me I had changed it 6 days ago. So, I changed my password, AGAIN, and now it's working again.
Not at all a simple or smooth process and I used to build my own PCs so I do know a thing or two about computers.