I have searched for ages on how to fix the issue of the "Invalid signature for profile key" error, I even looked on here, its been made into duplicates saying the issue is resolved but doesn't say how it was resolved or the method to resolve it!
I've tried changing my time from automatic to manual then back to auto, I've made sure all my timing settings are right, I've made sure my firewall is not blocking anything HOW DO I FIX THIS!
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I would also recommend adding the information that was requested for MC-253097:
Is this a migrated account? Are you opening to LAN or hosting a local dedicated server? Please include steps to reproduce.
I already migrated it wouldn't let me play the game till I did and I've restarted the launcher over and over for the past 4 hours it still wont allow me in. Also I am trying to join a friends server so, through LAN?
Then make sure that the friend's server has the clock in sync. (Restarting the server might help.) Also, if you have mods (just in case), remove them.
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We're tracking this issue in MC-253097, so this ticket is being resolved and linked as a duplicate.
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The easiest fix is to restart the game and the launcher. Yep, that's it.
Other fixes I'd suggest include:
Migrating your account to Microsoft Account if you haven't done it.
Checking your system clock (but seems like you've already done it?)