Can't make new Marketplace purchases

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Brief description of the issue:
The “Buy” and “Buy and Download” buttons are greyed out for all items in the Marketplace. I have previously made quite a few purchases.

Provide Screenshot(s)/video(s) of the issue encountered:

Detail steps to reproduce the issue encountered:

PC specs for those who want to assist (if not entered in your profile)

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Log out of XBox Live and log back in.

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Sorry, I meant to provide more details. I purchased this from Microsoft Store. I have signed out and back in again to the Store, signed out and back in again inside of MSFS, and finally I have disabled and re-enabled online services in Settings → General → Data.