For any that may have issues with Tagmo unable to write to the nfc tag. I was having same issues. Turns out that holding the tag very steady once it is detected is very important. It just takes a few seconds to write to the nfc tag but during the writing process moving the nfc tag will result in a failed write and error messages. That doesn't mean that the software is buggy, it means hold the tag steady.
I seem to get better results hovering the phone above the tag while the tag is on some surface (table, carpet etc) and holding the phone steady soon as the phone detects the blank tag. Hope this helps someone.
