Hello craiguccini!
Thank you for contacting the Microsoft community.
As we understand from your post, you were not able to complete your Microsoft Learn Challenge, because it ended before the estimated time. We are happy to help you!
Please know that you have reached the Microsoft Credentials Support, and our team provides support related to MCP Portal, any other platform or product is out of our scope, and the Certifications that we handle are the ones you can find through the following link: Become Microsoft Certified.
To verify the error, please share with us a PSR (Problems Steps Recorder) recording, showing the error.
Please bear in mind that the following steps must also be included in the recording:
Use Internet Explorer (version 9 or above) or Edge.
Clear all cookies and cache.
Allow all third-party cookies.
Use the InPrivate option in Internet Explorer or Edge.
You can use PSR (Problems Steps Recorder) tool by following the steps below:
If you are still unable to find your certificate, we opened a Private Message where we have requested information related to your Learn account to verify it and properly assist you. You can find the access to the Private Message, on the top right corner of this screen, as shown in the image below.

We are looking forward to your information. Just a heads up, remember to only send your private information through private message, in order to protect your data.
If no response is received within two business days, we will proceed to close and lock this case as well as the Private Message.
Kind regards,