To provide agency access to your Instagram business account, follow these steps:
First, ensure that the marketing agency has an Instagram account i.e.(https://www.instagram.com/thedigitalrestaurant/?igshid=ODM2MWFjZDg%3D). and that their account is connected to a Facebook Business Manager account.
Next, log in to your Instagram account and go to your profile page.
Tap on the three horizontal lines in the upper-right corner of the screen.
From the menu that appears, select "Settings."
From the Settings menu, select "Business."
Under Business Settings, select "Users."
On the Users screen, tap on the "Add User" button.
Enter the username or email address associated with the marketing agency's Instagram account.
Choose the role you want to assign to the marketing agency - either "Admin" or "Employee."
Finally, tap on "Send" to send the invitation to the marketing agency.
The marketing agency will receive an email invitation that they must accept to gain access to your Instagram business account.
NOTE: Once the marketing agency accepts the invitation, they will be able to access your Instagram business account, create and manage ads, view insights, and perform other marketing-related activities on your behalf.