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Do you have a seed backup of the Chameleon app?

No, unfortunately not.

hmm, then they are probably lost.
Strange that the Chameleon app doesn't open anymore. I also have the app installed from the very beginning and I have no issues opening it and using it.

Probably because in the meantime I have switched my smartphone, so it is no longer the very same app that was installed, but apparently a non-functioning "copy".