Multi Tenant Azure AD App with Azure Function


I am working on creating an Azure Function that is secured by an Azure AD App. I have the Azure Function part working and it is secured by Azure AD but now I would like to allow users in other tenants to be able to call this Azure Function and access the resources in their tenant. When I share the link to the Azure Function with a user the auth part works fine but then I get the following message.


Selected user account does not exist in tenant '{TenantName}' and cannot access the application '{ApplicationID}' in that tenant. The account needs to be added as an external user in the tenant first. Please use a different account.


Is there any way for me enable this scenario short of adding the user as a guest in the tenant?

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