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Business support is the correct support location
If you do not see Microsoft Credentials selected against Product, create an account on the Engage Center Hub and then use the direct link https://aka.ms/credentialssupport again. If that does not work try https://engagehub.microsoft.com/#view/Microsoft_AzureCXP_EngageHub/EngageHubMenu.MenuView/~/helpSupport/targetExperience/sfb/sapId/de16815f-2fa5-576e-4946-70cae21a4eeb