Please help! error message

i am getting this message in app center when i try to update apps:

Signature made ponedjeljak, 21. srpnja 2025. 17:38:16 CEST using RSA key ID FCF17B17F1F8E157
BAD signature from “EOS Flatpak Signing Key 1 maintainers@endlessm.com
Key expired četvrtak, 10. lipnja 2021. 19:47:38 CEST

Try following this manual

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