Hey there! Nice to meet you!
That is quite odd indeed. I've tried to check it here on my end and it appears to be working normally.
Since you have already performed some workarounds to no avail, you will have to contact Microsoft Rewards Support directly, as they are the only ones who are capable of investigating this case:
https://rewards.bing.com/support
Also, please do not submit multiple tickets, as this may reset your position in the queue and delay a response from the Support.
Thank you for your understanding! Please let me know if you need anything else.
Best regards,
Darhyl