@ Ashok,
Thanks for the link to the manual, already had tried resetting, no result. Tried agains, since the manual is not clear on which tamper switch to release for the final step in the reset. Tried all options - still no result after pairing again.
One important thing I noticed, however, was that I do get input on the Almond+ when the tamper switch on the Fibaro has been activated. If I hold my finger on the rearside tamper-switch and reset the tamper-alert on the Almond+ and then release the tamper switch, the Almond+ reports that the Fibaro has been tampered with within 1-2 seconds. Did this several times, success 100% of attempts.
Still, no result other than "open" - no matter what I do with the magnet near the fibaro, even when they are both just 20-30 cm from the Almond+ Nothing happens.
I am curious as to what you might have found in the log files, and your opinion to Gaz's input about incompatibility with Z-wave-plus devices from Fibaro.