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KvDaalen's avatar
KvDaalen
Copper Contributor
Mar 11, 2025

MS Teams access token signature is invalid

I am trying to validate an access token from ms teams in my backend application. The validation fails because the siganture of the token is invalid. This is how I obtain the token: export class M...
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microsoft teams
KvDaalen's avatar
KvDaalen
Copper Contributor
Mar 13, 2025

I tried to verify using the key set at https://login.windows.net/common/discovery/keys.

This the jwks_url from 

https://sts.windows.net/TENANT_ID/.well-known/openid-configuration.

The validation also fails with this key set.

I notice that the signature of the token is marked as not valid in JWT.io.

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