Hi Zuzana,
Thank you for sharing your question. I understand about downloading your Power BI Dashboard in a Day (DIAD) training certificate. I know it's important to have proof of what you’ve done and it's annoying when you can't find it. Certificates for Microsoft Learn training, like DIAD, are kept in your Microsoft Learn profile and Certification Dashboard. You might not see the certificate right away because DIAD is usually a workshop led by an instructor, and certificates are only sent out after the person in charge says you finished.
To fix this, log in to your Microsoft Learn profile and head to the Credentials area. Then, pick View Certificates under the Certificates tab. If your DIAD certificate is there, you can hit Download to save it as a PDF, or get a bunch of certificates as a .zip file. If you still don’t see it, the event organizer might not have uploaded it yet, or DIAD completion is tracked in a different way. If that's the case, check your email for directions from the organizer, or go to the Certification Support page for help. [learn.microsoft.com], [learn.microsoft.com]
May I also ask if you did DIAD through Microsoft Learn or with a partner? This will let me help you better.
I hope this answer is helpful, if you have any questions, feel free to reply.
Best Regards,
Noel