Auto-detect sign in issues

Use the alternative Checker Plus option: Adding accounts manually
Sign out and into each account again (Gmail cookies expire after account inactivity)
Blocking third-party cookies? Then allow this site mail.google.com (Instructions)
Deleting cookies? (ie. *.google.com) You will have to re-sign into your Gmail
Disable anti-viruses (ie. Avast) they can cause network issues
Privacy or tracking extensions can mistakenly block Gmail cookies (ie. Adguard, Disconnect, CCleaner or Ghostery etc.) More info
Try changing Firefox's Tracking Protection to "Only in private windows"
Did you Ignore email accounts in Checker Plus options
Do not set this Chrome option Keep local data only until I quit my browser
Use the Latest stable versions
Did you use Gmail account activity > Sign out all other sessions? Just sign out & into your Gmail
Is your browser closed and still want notifications? Make sure you enable the chrome://settings/ > Advanced > "Continue running background apps when Google Chrome is closed"
Delegated accounts will not be detected because you are not officially signing into them: solution.
Using non-Gmail or custom domains that are not Google Apps then refer to this issue
Try restarting your browser
Try restarting your computer (OS updates might cause issues)
Last resort #1: Try clearing your cookies which might have become corrupted over time
Last resort #2: Try the Corrupt browser profile instructions

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