This is the SharePoint lookup column threshold error. It happens when a list has more than 5000 items and the view or query you're hitting from Power Apps touches more lookup-type columns (Lookup, Person/Group, Choice, Managed Metadata) than the threshold allows, default is 8 per query.
First thing to check: which list(s) are over 5000 items. Go to the list settings in SharePoint and check item count, or just count roughly from the all items view.
Fastest fix: in Power Apps, on the screen pulling from that data source, reduce how many lookup/person columns you're referencing in the same Filter, Sort, or gallery Items formula.
Every lookup column you reference in a single query counts toward the threshold, including ones used just for display in a gallery if the underlying SharePoint view loads them.
Longer term fix on the SharePoint side: a site collection admin can raise the threshold (Central Admin or via PowerShell Set-SPWebApplication -ListViewLookupThreshold) for that web app, but Microsoft caps this and discourages raising it past a reasonable number for performance reasons.
Better long term fix: index the lookup/person columns you filter on most often. Go to List settings > Indexed columns > Create a new index on the specific lookup or person column you filter by. Indexed columns are exempt from this threshold for filtering purposes.
Start by identifying exactly which screen and which data source is failing, then check how many lookup-type columns that screen's formulas reference against that specific list.
Best regards,
Valantis
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