Thanks to Raudrive and ssa.
I did the pairing using the iPhone. It “seemed” to work. Here’s what I observed. First of all, the little Soundcore 2 speaker does come with a small booklet of documentation. The information is available in 10 languages! But for each language (mine being English) there is so little information that Anker must assume all users are teenagers not 90 year olds.
The solid blue dot on the speaker indicates that it is paired to my hearing devices. There is no mention of the speaker in the Nucleus 7 app or the Resound app. But on the iPhone/Settings/Bluetooth the Soundcore is listed as a device. Clicking on Soundcore initiates streaming. At least I think it does. The Nucleus 7 app says “not currently streaming”. And other sounds, like faucet in the kitchen, are not stopped as they are when streaming a video on the iPhone. I tried reducing the microphone level under Settings/Accessibility/Hearing Devices but that seems to reduce the music sound as well. It all seems rather strange. It’s a muddle of CD player/speaker/iPhone/hearing devices all competing. Still it does work and thanks for your help.