Channel bridge import - you have to enable channel management to use C/B?

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Yes, channel bridge is part of the channels premium feature. It looks like you've had that enabled for a while but recently disabled it.

Re-enable the channels feature and you'll be able to channel bridge again.

I was under impression that C/B was available whether you use the channel management proper or not (I do not - found really no need for it in my set up). I guess I was wrong.

Channel bridge was one of the first parts of the channel management area and is still the only way to do channel management for VRBO if you have less than 5 properties which is their requirement for API integration. We now have a lot more API integrations like Airbnb and booking.com and CanadaStays which do not have a property minimum requirement (and HomeAway/TA which do have a property minimum requirement), and the channel management feature includes all of those as well.

I had a look at your account and I see where the confusion lies -- you were using the channel bridge since the first betas. When we announced the channel feature last October, we gave everybody using channels at that time a promo price for a year (until Dec 2019): https://www.ownerrez.com/blog/introducing-ownerrez-channels -- that promo just expired this month.