I suggests two further fast tests:
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You can also plug in the dongle into a Windows 10 system and check whether it’s connecting there and do some basic tests, see Pairing the Original Black OSMC RF Remote Control with a Pi/Vero2/4k/4k+. This should prove if the dongle is broken.
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Also helpful information: If you insert a USB stick/pendrive into each of the Vero’s USB ports, does the “new media detected” menu pops up in the mediacenter? This shows that both ports are working as expected. Of course the file system on the stick should be one of the common types like FAT, FAT32, NTFS, ext3/4 or exFAT.