The current Endevour system is broken I have gotten the 3 Iconian TFOs on the list 6 times now today 3 before the server kill and 3 after and never once got the reward doing the TFO 3 times in a row.
I had Iconian TFO 0/3. I completed 2 and it showed 2/3. I swapped to another character to complete a different endeavor and wait for cooldowns. When I swapped back and it still said 2/3. Completed the 3rd Iconian TFO and it went back to 0/3.
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There is a bug which shows all the endeavors done, while this isn't the case. Usually it helps to change map for this, so it shows it right again.
I had Iconian TFO 0/3. I completed 2 and it showed 2/3. I swapped to another character to complete a different endeavor and wait for cooldowns. When I swapped back and it still said 2/3. Completed the 3rd Iconian TFO and it went back to 0/3.