Alexa, nabu-casa all devices removed - how to get back

Tags: #<Tag:0x00007f325acf6d98> #<Tag:0x00007f325acf6c30>

Hello,

I have removed all the devices from Alexa application level. Now I would like to bring them back. How to do it? When I try to run device discovery, no devices are found. Looks like all those devices which were discovered earlier and removed cannot be used any more.
Is there any way to somehow reset this “removed” state for all those devices?

thank you