@robski , thanks for replying.
Yes I cannot log in to old account because I deleted it... It was my fault to not unbind the device before... Today I emailed m5stack support and they tell me that they will unbind the device for me. I only have to send them the MAC address.
Hopefully tomorrow I will be able to rebind the device and have it listed in UIFlow2 under my account again.
Very quick and good m5stack support indeed :)

Today the support unbind my device and now I can correctly see it under "My devices" in UIFlow2.
The next time I will be much careful before deleting my account.
Have a nice day!

Today the support unbind my device and now I can correctly see it under "My devices" in UIFlow2.
The next time I will be much careful before deleting my account.
Have a nice day!

@robski , thanks for replying.
Yes I cannot log in to old account because I deleted it... It was my fault to not unbind the device before... Today I emailed m5stack support and they tell me that they will unbind the device for me. I only have to send them the MAC address.
Hopefully tomorrow I will be able to rebind the device and have it listed in UIFlow2 under my account again.
Very quick and good m5stack support indeed :)

I already try to reburn the UIFlow2.0 to the M5Stickc Plus 2 with M5Burner using this account, but when I log in UFlow2 website I cannot see my device listed.
I also try to burn the UIFlow1.0 and, even if I can use the device via API key and run programs, I cannot see my device listed in "My device" section.
Thanks.

Hi, I register an account and then I burn UIFlow2.0 to the M5Stickc Plus 2.
M5Burner asks to bind the device and I agree.
Next, I would change the bounded account with another one and I delete my account from M5stack without first unbinding the M5Stickc Plus 2.
I think I made a mess because now that I register my account to M5Stack again, I can't see my bounded device and so I cannot unbind it.
Please help.
Thanks.