Android version sync account does not retrieve new mail since being out of the USA

I went out of the USA on May to Ecuador and Peru, and on the same day the Android version of Thunderbird stopped retrieving new email from the server. I have used Thunderbird pointed to the same server on Windows 11 and Android successfully for years. I thought it might be something to do with being out of the country, but now I'm back in the USA, and sync account on Android still does not retrieve new mail that has accumulated since May 4th. I've been following my email using a webmail access so I know there's lots of new mail. I've closed and reopened Thunderbird on the Android, and I've tried sync account with the webmail access closed. I have not yet tried Thunderbird on my windows 11 laptop because I'm still not home yet. Any suggestions welcomed, thank you for your help! Email to [edited[ from community support forum] at Rcn dot Com...