@AK_ Thanks for posting in our Q&A. For this issue, it is not related to Windows 365. It is related Microsoft store for Business itself.
I have tried this web link in my environment, it shows as same as yours. When I refresh the page, it shows the following error message.
To get accurate help, it is suggested to call customer Service phone numbers to find the root cause.
https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
Hope everything goes well with you.
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