I watched a content creator do it on her iPad. She uploaded a video on how to do it on FB because she goes live on TT selling jewelry and has to use multiple devices to do so. I believe her iPad was new which is why/how she wanted to add it. I have android so this didn't apply to me, however this is what she did.
She went into the app store, changed her location, picked Canada, googled a Canadian address to put in (she picked a random Canadian address), she used her phones actual phone number with that fake address. Then she went to the app store and downloaded a VPN (she used Nord VPN but you don't have to) then chose a Canadian IP address, turned off wifi (turned on airplane mode for a few seconds) turned wifi back on, went back to the app store and was able to get TikTok back through the app store.
Hope this helps!