Hi @Prakash RanaThank you for reaching out to the community forum!
For your query I have understand you're facing an issue with activating your Microsoft Entra ID P2 free trial version. during the process you are getting error **43881.
**
We have researched on this error code and noticed few cases internally regarding this error, this can be resolved by contacting our support you can reach out to our support team by look into below article to get support numbers depending on your country.
https://support.microsoft.com/en-gb/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
Get a case created with our subscription team further they will validate your details and the team will be assist to activate the P2 premium free trial.
Hope this answer helps. Do let us know if you any further queries.
Thanks,
Akhilesh.
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