Error with Instant Flow Trigger
Can you please share, just your simple flow where you try to access it in a condition, please.
Also note that SA's will not guaranteed have access to everything, including every row of data, so I would not recommend using an SA account, but use one that for sure (as a test) has full access to the table that is in the Trigger.
If you can share what the Output of the Trigger is, what the Condition expressions are and also for kicks, toss a compose above the Condition and try to access a field there and please share the input to it (and I expect then an error, unless its an error only in the condition)
Once I see that it will be easier to hel pyou.