iPad. Bedrock version, and Minecraft is up to date.
I am also having this problem. Both my daughter's iPad's can't connect to the marketplace, and we can't access their resource packs. Internet is fine.
My issues seems to be slightly different. My daughter's iPad cannot load existing maps if they get "too big," but can start up new worlds ok. I say "too big" because they aren't very big (AT ALL) and she has a newer iPad that can handle it just fine.
Aha! That fixed it...such a simple thing after all this! Thank you!