Hi @shivani shirguppi ,
It seems like the user is able to initiate the transition but it fails when trying.
As a first step I would look into the workflow to see if there are any validations during this particular transition. I imagine this can happen if the jira admin validate on a specific field during the transition, but the transition screen is missing or the transition screen does not contain the field that is validated.
best regards
/L
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