Hi @john.gateley , thank you for your detailed response.
I can see the downsides of making email address unique across tenants but routing to appropriate tenants is becoming tedious if we don’t have unique constraint.
Do you have any recommendation for routing requests to appropriate tenants in multi tenant applications?
I see this old unanswered question which explains this use case in detail: How to have one login page for multiple tenant regions?
Note that we are planning to use cloudflare proxy with custom domain.