Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
We checked your post tag sitemap and we can see it is working properly without any issues:

In case, you’re still facing any issues, please share a screenshot with us by using any image-sharing tool like https://imgur.com/upload so that we can check this further for you.
Looking forward to helping you.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.