I'm trying to recover my BOINC account for when the folding@home project for covid-19 is completed and taken down, as I still stand as our forum's #6 all time contributor to milkyway@home and I'd like to potentially bump that up again, but I can't for the life of me remember what e-mail I seem to have used for all my BOINC accounts. I don't think I created a special email just for them but when I go to search my inbox history for all of my boxes, I can't seem to find anything (unless google deleted it). Does anyone have any idea how to identify the e-mail associated with a given account? I've tried every e-mail i've ever used for any purpose and they've all come back as invalid. I haven't even been active on this forum in years but it'd still be nice to contribute again for the team at some point.
Unless you've completely removed BOINC on all your computers, in you're on windows you can try using File Explorer and opening-up \programdata\boinc (programdata is a hidden directory) and you should have one account_project_url.xml per project. If you open-up one of these account_project_url.xml, you'll have one line tagged with "authenticator" and a long string of hexa-decimal numbers. Most BOINC projects allows you to use this authenticator to log-in to their web-pages and after you've managed to log-in most BOINC projects allows you to see your email-address.
Meaning, if you've used same email-address on all BOINC-projects, as long as you've got account_project_url.xml for a project that is still active, it should be possible to find your milkyway email.
Which leads to the interesting observation that I am TeAm founder on Milkyway, not TAC.
I tried to log in as TAC, but I got the same message as you that the email address wasn't found. I wonder if there's some bigger problem?
Quick look, I had no problems logging into Milkyway with my account, so possibly TAC has never been a member of the Milkyway. Now interestingly enough, it seems all users are still listed at Milkyway.
As a comparison, on Climateprediction.net many are listed as "old_user###", most likely this is all users that haven't updated their settings after Europe changed their internet privacy-rules a few years ago.