Also, are you actually copying it from one stack to another if you've renamed the old one?

I can now that encrpyted config values depend on the directory where the

pulumi

command is run from in my current structure

new_proj/
   old_proj/
        __main__.py
  __main__.py

commands:

cd new_proj
pulumi config --show-secrets  # empty as expected

cd old_proj
pulumi config --show-secrets # returns values

cd ..  # back to new_proj
pulumi config --show-secrets -C old_proj  # error 400 auth failed

pulumi config refresh -C old_proj 
pulumi config --show-secrets -C old_proj  # returns values

however none of the commands above helped to resolve the issue with copying the config:

cd new_proj

pulumi config cp --dest owner/new_proj/staging -C old_proj

also

-v 3

does not give any debug log

I seem to be confused from stack names and organisations

if I understand it correctly the naming is

owner/project/stack

however on the website there is one more box

stx/tqs-backend

is the repository - does this play any role in the naming? what would be the actual name of the project and stack inside? I have a project called

old_project

there with stack

staging

Is the fully qualified name:

owner/old_project/staging

or is it

owner/stx/tqs-backend/old_project/staging

? Or something completely different because some other projects are created directly in my namespace

Hmm in the end I managed to do it using automation api:

from pulumi import automation as auto

owner = 'owner'

new_project_name = "new_proj"
new_stack_name = f"{new_project_name}/staging"
old_project_name = "old_proj"
old_stack_name = f"{old_project_name}/staging"
new_stack = auto.select_stack(
    stack_name=f"{owner}/{new_stack_name}", project_name=new_project_name, program=lambda: ""
)
old_stack = auto.select_stack(
    stack_name=f"{owner}/{old_stack_name}", project_name="does not matter", program=lambda: ""
)

old_stack.refresh_config()

# update project config namespace
new_config = {k.replace(f"{old_project_name}:", f"{new_project_name}:"): v for k, v in old_stack.get_all_config().items()}
new_stack.set_all_config(new_config)

# update new stack
new_stack.up()