To all SwiftKey users who stumble accross this post: Do not update your SwirftKey app at the moment!
Today I updated several apps on my Android 9 Huawei Mate 20 Pro (non-rooted), among them also the SwiftKey application. After this update my keyboard was gone, completely. Unfortunately I had the great idea that this could be solved by restarting my phone. But after the restart, when asked for the password (the entering of the pin worked fine; there was a numpad) there was and is no keyboard to enter anyting. i.e. the password.
This issue renders my whole device useless. In addition I have no clue on how to solve this and even if I did, I wouldn't be able to access my phone in any way (I think? Because even a connection to a computer would be denied without allowing USB debugging... Am I right?) - e.g. update SwiftKey again. SwiftKey is the stock keyboard of the Huawei Mate 20 Pro...
I wrote something very similar on the SwiftKey "Support" Page (here) - which is a community-help-itself-site, i think. (It's incredible that there is absolutly no possibility to contact SwiftKey directly, or am I mistaken?) But I thought the kind people here might be (way) more competent, especially if will I have to access my phone through a USB connection without the possibility to enter my password...
Any help is greatly appreciated. :) Many thanks.
Use OTG adapter with an external keyboard. For details see accepted answer and this Reddit thread.