I wasn’t clear, sorry. It did not work in any of the mobile browsers. It did work in another browser on my laptop.
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Excellent. good to know. I’m glad you got it working! 
But I haven’t. I only got it working in another browser in my laptop. It still fails in my smartphone.
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Oh now I misunderstood you - I thought you meant when you switch browsers it suddenly worked on your phone. 
Ok so you have 2 browsers on your laptop that can do it, but no browser on your iPhone can enable encryption?
Correct. Nor in the Discourse App (althought I guess it is just a wrapper around the same engine that Safari uses).
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Discourse Encrypt has been deprecated we are no longer tracking issues with the plugin on meta.
To move anything forward here a third party plugin will need to be created and maintained (in a dedicated plugin topic)