A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Hi,
Thank you for querying in this forum.
I went through the post carefully. I'm afraid there is no out of box feature in Microsoft List to generate a ID with a custom prefix when a new row is created. Very sorry for the inconvenience.
Per my search, you may try to use Power Automate. Here is a similar thread for your reference: Add custom prefix to unique ID
If you need further help, considering we have a dedicated channel Microsoft Power Automate Community where members and engineers in the community are proficient in the knowledge of this kind of questions, to make sure you get professional assistance, I sincerely recommend you post the question in that community, members and engineers will also focus on your specific situation and provide specific suggestions.
Your patience and understanding are highly appreciated. Hope you have a safe and happy new year!
Best regards,
Tina