The error is probably on Mojang`s/Microsoft`s side. Authentication servers should be back quickly (a few minutes). Otherwise it could be a problem with your internet connection. Maybe you have a firewall not configured to let your Client communicate with the Authentication servers?
To join the MCME server you best use version 1.18.2. With later versions you'll have some weird textures.
There's a twitter account by the Mojang Helpdesk that sometimes help to find out if it is a global problem or not https://twitter.com/MojangStatus
Issues logging in should be resolved by now.
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