401 unauthorized: Integrated App with a customer store

Shopify Partner
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I've been experiencing this weird error that tells that the token is incorrect.

I didn't change anything in the app and everything were working fine (api calls and webhooks).

When I searched, I've found that offline access token doesn't expire.

Can someone help me on that matter?

P.S.: I did try to use postman and see where the problem is, I've got the same error. This is the Request Id: c42be1e7-b207-4324-a23a-fb28f0e1a1be