[MC-82960] Minecraft:End_portal does not excist

Cannot create an Ender Portal, minecraft:end_portal (as stated on the wiki) does not work in the /give command.

Linked issues

place all frames from the center to the outside

It does exist, it just isn't obtainable using /give. Try /setblock instead 🙂

Based on your screenshot, the portal didn't work because there should be a block under each portal frame 🙂
(there was no blocks under 3 frame...)