Accessing Microsoft Teams Free using personal or organizational credentials
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Hi @CedarChen
Error 53003 means the sign-in succeeded, but access was blocked by the security policy of the organization or Teams workspace you are trying to enter. This can still happen with a personal account if it was invited as a guest to an organization.
Please sign out of Teams completely, then open Teams in a private browser window and make sure you select your Personal account rather than a work/school organization. If the error appears only when opening a particular organization or meeting, you will need to contact that organization’s administrator because only they can review or change the access policy.
Please let me know if you need any further assistance. Have a nice day
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