Hello @Phoenix_Onesong ,
Social platforms, especially Facebook (and by extension Instagram), will occasionally refresh their API permissions, which requires 3rd party connections to have to be re-established by the users. You can disconnect a social page from your Constant Contact account from the Social tab. You may also need to revoke our permissions on the Facebook (or other social app) side as well. Then you can reconnect the page and reinstate those permissions from the Social tab in your CTCT account.
You'll also want to check that the Instagram account you're connecting is a true business page, not a creator page (they will look similar but have very different API and permissions restrictions. If it's set to be a creator page, you'd need to get it swapped back to a professional setup.
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