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After killing boss in t17 map Ziggurat cant unlock 6 slot map device. I try multiple maps, try restart game. Nothing work.. any solution?

I think there had been an issue with unlocking the 6th slot for players who'd been in Private leagues for Settlers, unlocked the 5th slot with the Maven 10-way, then migrated to Settlers league.

There might not be any help you can get from here.

If completing another "Maven's Invitation: The Atlas" (10-way) doesn't unlock the 6th slot, I'd suggest you try contacting GGG's support via the email on the "Contact Support" page linked at the bottom of the page.