USB/SDHC mounts as read-only

[Faradn]

Greetings,

I've got a USB/SDHC e/w a SanDisk™ 32Gb and it auto-mounts
as read-only every time it's installed.
The adapter mounts fine as read/write in my Odroid XU4 and
Raspi 3B. 

SBC: RockPro64 4Gb
OS:   Debian Stretch w/Mate' DE (Kudos to @MrFixIt and team for a great OS build!)

Any suggestions?

TIA,
/Faradn