2. Make the bot an admin of your group.
Please make sure you grant admin right to the bot to your group by following these steps:
Click on your Group name → Info
→ Add admin → Click on the bot (fgmanager)
On the pop-up
with admin rights that will appear, please choose the following rights by switching toggles:
Change group info → OFF
Delete messages → ON
Ban users → OFF
Pin messages → OFF
Add new admins → OFF
Can't find? See an example of how it looks on mobile here
or desktop here
The navigation might slightly differ on desktop / web versions, please look for similar options.