This issue has been resolved in v3.5.8 - 6th Nov 2020.
Due to a breaking change by Facebook to the Instagram API, the fix we originally put in place on v3.5.7 presented a new error. Please ensure you update to 3.5.8 to resolve this. Sorry for any inconvenience.
Due to changes with Instagram's API the feed is currently offline. We are currently working on resolving this issue and awaiting review by Facebook.
At present we don't have any indication of when this will be resolved so please bear with us. An update of Momento will be made available as soon as possible.
Sorry for any inconvenience this has caused in the meantime.