Hi Guido,
Thanks for the detailed report!
kurv.gr are shortened links (like the retired
goo.gl), so they
need first internet to process them, i.e. expand them to their
actual long
kurviger.de links and then use them.
So the procedure is usually that the browser is initiated to
process the link, then for the expanded link a popup should appear
with the Kurviger app among the options.
At least that's what we see by testing with Gmail or Inbox and
various
kurv.gr links.
So if all are set correctly as you mentioned - i.e. not having
some app by default to consume all links for itself without popup
dialog - then wondering if Google Keep affects somehow all that.
BTW can you do a test with Gmail or your email client to see what
happens in your device?