How to enable OEM Unlock on SM T500 Tab A7/VBMETA error when rooting?

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Android Central Question

Using fw BUJ1. I had previously rooted the device and it was working fine, then didnt use the device for a cpl of week and after charging, when I switched it on it wouldnt boot (teal screen with 'enrolled knox guard prevent flashing factory binary (vbmeta)' displayed) so I reflashed the stock binary. Now when I go into dev options, I cant get OEM unlock to appear (tried the date forward/back.. didnt work). Anyone know how I can fix that?

Additionally, in download mode the tab shows 'oem lock off (u)' and 'kg status normal', but when I try to flash the magisk modified ap file to root it, it fails almost at the end of the odin process with the 'enrolled knox guard prevent flashing factory binary (vbmeta)' error displayed on the download screen. Rebooting then boots back into the stock android. Is this likely to be linked to the owm unlock being unavailable in dev options even tho the device is showing oem lock is off?
 

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