Thanks for posting in Q & A forum.
As long as the subscription status is registered and you are not seeing an error message that indicates that no subscription is linked, then the subscription must be linked.
Follow below steps
- Switch Directories to the location of your target Azure subscription
- Under Marketplace, search B2C and select 'B2C'
- Select "Create to link this B2C Tenant" to a subscription
refer- how to create an ad-b2c tenant under existing subscription
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