At times we have got the below error while setting up trial for Dynamics 365.
We tried out different options and tried creating few new trial instances but we got the same error in all of them.
Eventually tried it again after 2 hours or so and then the setup was successful, so might be some issue at the platform level.
Others have also faced similar issue before
https://community.dynamics.com/crm/f/117/t/137752
Hope it helps.
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