I need to apply a $25 credit to our Microsoft 365 subscription

[Richard2012]

Our subscription to Microsoft 365 will automatically renew in July. The subscription is under my wife's accout (we share the app). I have a $25 credit in my Microsoft account. How can I apply this to the subscription charge? Thank you.

[#2]

@Richard2012 

May contact Microsoft support if you are not able to access Admin Center

[#3]

@Kidd_Ip I've tried, multiple times.  They do not respond.