Could not sacrifice Elsewhere Flask in a situation.
I could not sacrifice Elsewhere Flask when I should have been able to (Elsewhere Flask does not require it to tap to sacrifice it.)
I had Inspiring Sanctuary (gives non-artifact spells improvise) and Elsewhere Flask on the battlefield.
I tapped the Elsewhere Flask to cast Corrupt and activated full-control so that I could sacrifice the Elsewhere Flask while Corrupt was on the stack.
After casting Corrupt my only option button was "Resolve" - my Elsewhere Flask was not highlighted and I could not click it to activate its ability. Elsewhere Flask does not require it to tap to sacrifice it.
After my Corrupt resolved I was able to sacrifice Elsewhere Flask like normal.
System - Windows 10 PC.
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dancingwolfe#40291 commented
I have experienced a similar error when using Inspiring Sanctuary. I play a vampire deck and tapped a blood token to pay the generic side of Deadly Dispute's mana cost. I then went to sacrifice that same blood token to pay the additional cost on Deadly Dispute, but Arena would not let me do so. I am not aware of a rule that would preclude this action.
System - Apple M1 Pro with Mac OS X Ventura