For the last 9 hours the launcher has kept flashing offline and online and logs show a 403 error on https://api.minecraftservices.com/entitlements/license
Offline mode MC Java launches just fine but I can't play on Realms after this started happening (getting this issue: MC-252942)
20 hours ago it was fine. Might have been the previous version, not sure.
I purchased the Java version roughly 11 years ago and have since migrated to a Microsoft account.
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@Jess Edward Thanks. I assume you mean the Mod Notice which talks about incompatible software. I have a firewall and Discord installed. However, Discord isn't running, and even without the firewall active I have the same issue. And my friend just uses Windows Firewall and has the same issue. Like I said, it's been working for around five years with my current setup - nothing's changed here. I ran the recommended Adware scanners and nothing was found.
Or did I misunderstand you?
EDIT: I should note that my current Internet provider blocks the ports 135, 139, 445 and 548 on TCP - and 135, 137 and 138 on UDP. Are these a problem? It hasn't been a problem for the last 8 months, but maybe something changed with MC?
The note has a list of possible incompatible software.
Community Support can help find the problem.
The problem fixed itself today. I still suspect it was an issue on Mojang/Microsoft's auth servers or something
Please read the highlighted note in MCL-11510.