Merging two microsoft accounts

Copper Contributor

Hi, in current tenant we are using as account name for all users, so all our Microsoft products (office, teams etc) need user to login with user(AT)


Now we would like to use our company domain, where user then can login use user(AT)


Question is in our company some already have their user(AT) registered as a microsoft account. So when we switched to our custom domain, what would happen to their existing individual account with user(AT) Would the two merge or they don't have access to their old account anymore?


Thanks for clarifying.


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