error upon updb :The "pm_thread_access_time" entity type does not exist.

We need more info:

• Which was the value of "value" column from the "key_value" table for "collection" = "system.schema" and "name" = "private_message" before you've started the update?
• Which was the initial module version before you've started the update to 3.0.4?

answer to value from key_value table for collection system.schema name private message -- value is i:8014;

i did a cim before the updb and now i dont get the error. thanks

Why is this issue marked as fixed? I'm having the same problem.
My prior version is: 8.x-2.0-beta18
Prior system schema version: 8006.

Same exact error message.

Thanks!

firstlut because if you run a cim first before the updb the issue is fixed.

OK, I figured this one out. The entities were deleted, but a couple of View Modes are still hanging around:
core.entity_view_mode.pm_thread_access_time.token
core.entity_view_mode.pm_thread_delete_time.token

You have to delete these orphaned config entities with Drush:
drush cdel core.entity_view_mode.pm_thread_access_time.token, core.entity_view_mode.pm_thread_delete_time.token

For reference, here's the Drush manual page.
Changing status back to "Fixed."

Automatically closed - issue fixed for 2 weeks with no activity.

update - with a new database and code what i had to to was manually go into the all of the files that started with core.entity_view_mode.private_message. and core.entity_view_mode.pm and add a description: "" line
then do a cim and then do an updb