Hello ManuKP1988,
Thank you for bringing this matter to our attention.
Our Engineering team found an issue in claiming the discount for Ignite Cloud Skills Challenge March 2021. We got an update from them today and confirmed that this has been fixed.
You may perform the troubleshooting steps below that may eliminate the issue:
If you are using a work machine, please try to use different device or personal computer to make sure that there’s no restriction.
Use the new MS Edge browser that you can download here.
Make sure to clear all your cache and cookies (steps here) and disable the Block all third party cookies function from the browser settings.
Use an Incognito or InPrivate browser and go to Microsoft Certification Dashboard and try redeem the discount.
If same issue persist, please send us a step by step screenshot using Problem Steps Recorder (PSR) starting from the steps above and until you received the error.
You may upload your PSR through the private message I initiated along with the requested information.
To access your private message, please refer on the image below or click on this link.

As for your company discount, we highly suggest to check with ESI Support for further information and assistance on this matter.
If this solves your problem, please indicate “Yes” to the question and the thread will automatically be closed and locked. In case we do not receive a response, the thread will be closed and locked after one business day. Please be advised that after the case is locked, we will no longer be able to respond. If the resolution provided did not resolve the issue, please post a new question.
Best regards,