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Suggested by Ryota Kadoya New 

Customer can select "deprecated regions", when they create cloud hosted. This Docs says : https://docs.microsoft.com/en-us/dynamics365/fin-ops-core/dev-itpro/deployment/deploymentfaq#what-regions-are-supported-on-self-service-in-north-america "Central US is no longer being provided as an option for self-service migrations beginning April 1, 2021." Customer claim that deprecated regions should not be able select. We requested to the below two points. - Disables the select of "deprecated regions". - If they can select it, you have to pops up of caution.