Hi @Mallikarjuna to further add to @Dan Tombs answer also ask your admin to check if there is a condition on the workflow transition that could be blocking this.
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Hi @Mallikarjuna in order to transition issues between statuses you need to have the transition issue permission attached to your user. If you do not have that then errors like this could show.
In order to provide additional assistance I'd advise to speak to your company administrator as we'd need to check the projects permissions and your user.
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