I have a subscription and have purchased (online) much of the resources including TCoE.  Yet, I am unable to see it when selecting a Cleric subclass.  I am unaware if there are others from any other resource.

That subclass was originally published in Ravnica, so you have to turn n M:tG content for that character.

Just downloaded the relevant materials and restarted, rebooted, updated resources, signed out, etc and it is still not showing up.

Did you turn on M:tG content for that character?

Ok.  Showing my stupid.  What book does M:tG refer to?

M:tG = Magic the Gathering and is a setting in the homepmage of character creation. At this point these include:

• the guildmasters' guide to ravnica
• mythic odysees of Theros
• Strixhaven a curiculum of chaos

Thank you.  All is working now.  Very much appreciated.