Greetings!
Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
NOTE: Remember that while the "migrating" state is in effect, certain functionalities may be limited, and it’s best to wait until the migration is complete for full testing.
- There is No another way to test the AFD endpoints before the Effective Endpoints.
Migrate
Once migration begins, the Azure Front Door (classic) profile gets disabled and the Azure Front Door Standard, or Premium profile gets activated. Traffic starts flowing through the new profile once the migration completes.
If you decided you no longer want to move forward with the migration process, you can select Abort migration. Aborting the migration deletes the new Front Door profile that was created. The Azure Front Door (classic) profile remains active, and you can continue to use it. Any WAF policy copies need to be manually deleted.
Service charges for Azure Front Door Standard or Premium tier start once migration is completed.
Refer: https://learn.microsoft.com/en-us/azure/frontdoor/tier-migration#prepare-for-migration
Hope this clarifies!
If above is unclear and/or you are unsure about something add a comment below.
Please don’t forget to close the thread by clicking "Accept the answer" wherever the information provided helps you, as this can be beneficial to other community members.
Regards,
Ganesh