Hello, and thank you for your answer.
To clarify, the problem is not with the import itself, since no import even started. All the jobs I've created since the first one (which was the only one to run with success) had never even started the import process, since they never pass the stage of "Analysis in Progress"
answering your points:
1) I've tried from different networks, but uploading is not an issue. All pst that I've uploaded where completed successfully, and I can also see them in with Azure Storage Explorer
2) I don't see any "view details" option, but if I click on any of the jobs the details are as follows:

No import process even started, so no imports on any mailbox
3) I've created lots of new imports that never pass the "analysis in Progress" stage. I've tried uploading different pst, with different names with no luck. Also created lot's of mapping files with just one pst and always the same result. It seems that after the first job that work, all the other I've tried failed at the same stage. I guess something got stuck or else, but seems to be an issue that needs to be resolved from Microsoft side, since there is not much I can do on my part. I can not even cancel the jobs, nor they ever seem to fail, just stuck forever.
Hope this helps, and find a way to solve this extremely annoying issue.
Thank you.