Thanks for posting your question in the Microsoft Q&A forum.
May these articles help you:
https://learn.microsoft.com/en-ca/azure/architecture/example-scenario/multi-saas/multitenant-saas
https://azure.github.io/azure-saas/diagrams/
https://learn.microsoft.com/en-us/azure/architecture/guide/saas/plan-journey-saas
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