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This means you tried to flash custom software while FRP was active. You cannot flash TWRP or custom kernels. You must flash the official Samsung recovery firmware first, then apply the bypass.
Without bypassing this, the tablet is a brick. Here is how to unlock it. Unlock FRP on SAMSUNG Galaxy Tab A8 10.5 -2021-
When buying a used Tab A8, always ask the seller to remove their Google account before factory resetting (Settings -> Accounts -> Google -> Remove account). That prevents FRP entirely. This means you tried to flash custom software
If you are frustrated, pay $10-15 for a remote service: pay $10-15 for a remote service: