Game automatically Progressing to Combat from Main Phase 1 due to empty hand. Pre-combat interaction on board
I have essence Channeler on the battlefield (as long as I've lose life this turn, it gains Vigilance and Flying until end of turn)
I also have Caves of Koilos on the battlefield (Tap: Add Black or White, it deals 1 damage to me).
I haven no cards in my hand at the start of my turn. I proceeded to Draw and draw Shadowy Backstreet.
I play Shadowy Backstreet as my land for turn, it enters tapped and I surveil a Swamp from the top of my library to my graveyard.
The game automatically progressed to declare attackers. I was not given an opportunity to tap my Caves of Koilos to ping myself for 1 to get Vigilance. I should have been prompted to move to combat instead of just automatically moved to it.
This has caused me to lose multiple games, and while I might not have won this game, we will never know because I was denied the opportunity.

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Bubuchi_Naila#88844 commented
I had thesame thing happen to me but while on defence. I should have been able to ping myself with Caves of Koilos to give my Essence Channeler flying but I wasn't given the chance to.