Grant service principal access to application in other tenant

Question

I have an Azure AD service principal in one tenant (OneTenant) that I would like to give access to an application in another tenant (OtherTenant).<

Answer 1

Taking the command as is from your question:

New-AzureADServiceAppRoleAssignment `
  -ObjectId  `
  -Id  `
  -PrincipalId  `
  -ResourceId 

Try changing the last parameter value i.e. ResourceId

Currently you're passing

Replace that with