Thank you for posting this in Microsoft Q&A.
There is no way where you can use Azure resources in one tenant and utilize the credits from another tenant.
Credits will be charged on the same tenant in which you are utilizing the resources.
You can try to contact the Azure subscription team to check if they can help you in moving the credits to another account or to another tenant.
https://go.microsoft.com/fwlink/p/?linkid=2202692&clcid=0x4009
Let me know if you have any further questions.
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