Koodo Tech helped with part 1. Part 2 they said was not a Koodo problem, but I figured out a work-around
Part 1: We live on a large rural property that has very spotty cell service of only 1 bar at most. We have a garden and sugar shack area that gets decent wifi but is still a couple minutes walk from the house. We were using wifi calling and texts to communicate between that area and the house, but calls often wouldn’t go through, although texts would.
The solution for this was to enable Airplane Mode when we are home on the property, which forces the calls to use the wifi. This has worked beautifully. Thank you to the Koodo Tech working out of Rimouski who explained the issue and helped with the solution.
Part 2: Although we always had wifi calling enabled, it would sporadically just stop working altogether. Texts for 2-Factor authentification services would suddenly stop being delivered, for example.
I *finally* figured out that the issue would arise when we would leave home and again connect with cell services.
The solution for this is that we now turn OFF wifi calling when we are about to leave the property, then turn OFF Airplane Mode (see Part 1). We then turn both services back on when we return home and we have had no more difficulties with wifi calling here at home.
It may be a quirk of our home network, it may be related to our internet provider, Koodo denies it is related to them.
If anyone with a better technological understanding of these things has any ideas, I would love to know what could be happening, out of curiosity.