Hello HITESH P
Thank you for reaching out to us.
Regarding your question, Azure Git currently allows up to 5 members per group. Unfortunately, we cannot increase this limit. However, you can create multiple groups to accommodate more members.
Each group can have up to 5 members, and you can create as many groups as you need. Regarding the associated costs, there are no additional costs for creating multiple groups. You can create as many groups as you need within your current subscription. I hope this information helps.