For the exam retake policy, refer to https://learn.microsoft.com/en-us/credentials/support/retake-policy
As per this document (in regard to fundamentals exams):
- You must pay to retake the exam (if applicable.)
If the above response helps answer your question, remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution. Your contribution is highly appreciated.
hth
Marcin