I'm also seeing this behavior in Minecraft Bedrock v1.16.21, running in Minecraft Realms on a Nintendo Switch in survival mode.
Regardless of where the anchor is placed, and despite the fact that it's fully charged, I respawn back at world spawn with the error "Your respawn anchor was out of charges, missing, or obstructed".
Breaking and re-placing the respawn anchor in survival doesn't seem to have any effect. I've also tried breaking the anchor with a Silk Touch pickaxe and re-placing it, as well as breaking it with a normal pickaxe, re-placing it and filling it back up with glowstone. None of these experiments seemed to impact the bug.
I'm also seeing this behavior in Minecraft Bedrock v1.16.21, running in Minecraft Realms on a Nintendo Switch in survival mode.
Regardless of where the anchor is placed, and despite the fact that it's fully charged, I respawn back at world spawn with the error "Your respawn anchor was out of charges, missing, or obstructed".
Breaking and re-placing the respawn anchor in survival doesn't seem to have any effect. I've also tried breaking the anchor with a Silk Touch pickaxe and re-placing it, as well as breaking it with a normal pickaxe, re-placing it and filling it back up with glowstone. None of these experiments seemed to impact the bug.