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Restriction by URL attributes
With a capability for Azure Front Door instances to connect PowerApps Portal comes, we can securely benefit them at most. But since public can directly access the PowerApps through it backend url ([name].powerappsportals.com) this could expose to a new hole for security concerns as Front Door cannot evaluate all traffic going through there.
Although Azure Front Door can be the only one traffic to an app, we cannot implement it in PowerApps as Azure Front Door have a dynamic IP and PowerApps only able to restricts by IP.
If we can achieve that in PowerApps, it will be a big win for everyone.