Signature not working on mobile phones

I have the signature field working using mouse or stylus on desktop forms, however, it isn’t working on mobile. Android or Apple. Moving the stylus or finger over the signature field shows nothing, blank. Form can’t be submitted without the signature.

Plugins were disabled and form tested. Desktop form worked successfully with a signature. But mobile is not, using mouse or stylus. I have checked that the pen colour is black.

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