When no entity matches the <destinition player/entity> argument, if fails to send a command failed feedback when no [target player/entity] is specified.
Steps to reproduce: spawn a zombie that is not named bob123, and use the following commands in the chat:
/tp @p @e[type=Zombie,name=bob123]
/tp @e[type=Zombie,name=bob123]
/tp @p @e[name=bob123]
/tp @e[name=bob123]
As you may notice, when the [target player/entity] is not specified, no error message is made.
Linked issues
Comments


What exactly was the armor stand named? If it's named "bob123" it should work.
You didn't name the armor stand correctly, regardless, a error should pop up for the ones without the target entity specified.
Changing ticket.

I created the named armor stand two ways, neither worked. One was with the Summon command the other by renaming a generic stand on an anvil in creative mode.
/summon ArmorStand ~ ~1 ~ {ShowArms:1,CustomNameVisible:1,CustomName:bob123}

I am trying to teleport myself to the armor stand

And technically I would think there may be underlying code branches that differ between a live entity like Zombie vs an object like an Armor Stand...in other words your test may not be exercising the same code path.
Can confirm in 20w48a. Here's some updated steps to reproduce the issue as command usage has been changed since this report was posted.
1. Spawn a zombie that is not named bob123.
2. Run
/tp @e[type=zombie,name=bob123] @p
You will notice that the output of this command is, "No entity was found". This is correct.
3. Run
/tp @e[type=zombie,name=bob123]
You will notice there is no error feedback. Edit: This step is no longer an issue.
4. Run
/tp @e[name=bob123] @p
You will once again notice there is no error feedback.
5. Run
/tp @e[name=bob123]
You will once again notice there is no error feedback.
To conclude, when the Target Player or Entity is not specified, no error feedback is displayed.
Can confirm in 21w05b.
This is actually a duplicate of MC-256419.
Are there any entities that should be teleported?