scheduling & cancelation in MS learning is not let me and throws below error

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AADSTS50020: User account 'xxxxxxxxx@gmail.com' from identity provider 'live.com' does not exist in tenant 'Microsoft Services' and cannot access the application 'b9c392b1-7049-4d6c-86bf-9bb91214900d'(Microsoft Learning Identity Service) in that tenant. The account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account.
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Request Id: edb7f606-b222-4c8f-9f73-fdd316e70a00
Correlation Id: a48f85cb-07aa-4554-b23d-89e0adf07260
Timestamp: 2021-03-06T00:03:57Z
Message: AADSTS50020: User account 'xxxxxxx@gmail.com' from identity provider 'live.com' does not exist in tenant 'Microsoft Services' and cannot access the application 'b9c392b1-7049-4d6c-86bf-9bb91214900d'(Microsoft Learning Identity Service) in that tenant. The account needs to be added as an external user in the tenant first. Sign out and sign in again with a different Azure Active Directory user account.
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