In this case the account you are using does not have access to resource in the tenant, please check with your tenant administrator for the access and also for the training issues please raise the query on the dedicated forums .
Maybe one of the links is helpful:
Microsoft Training & Certification is supported on their own forums:
Microsoft Certification - Exams: https://trainingsupport.microsoft.com/en-us/mcp/forum/mcp_exams
Microsoft Certification - Exam Registration: https://trainingsupport.microsoft.com/en-us/mcp/forum/mcp_exams-mcp_exam
Microsoft Certification - Vouchers/Discounts: https://trainingsupport.microsoft.com/en-us/mcp/forum/mcp_exams-mcp_offer
Hope this helps.
Please Accept the answer if the information helped you. This will help us and others in the community as well.