R Package Development Error: cannot open URL

Question

I've created two R packages.

Now I'm in a situation in which I need package2 to rely on package1.

In the project for package2, I've run this line of code:

usethis::use_dev_package(package = "package1", type = "Imports", remote = "gitlab::my_gitlab_name")

which updates the DESCRIPTION file to read the following:

Package: package2
Title: My Package title
Version: 0.0.0.9000
Authors@R: 
    person(given = "My",
           family = "Name",
           role = c("aut", "cre"),
           email = "myname@myemail.com")
Description: My package does somethings.
License: file LICENSE
Encoding: UTF-8
LazyData: true
Roxygen: list(markdown = TRUE)
RoxygenNote: 7.1.2
Imports:
    data.table,
    dplyr,
    package1 (>= 0.0.0.9000)
Suggests:
    testthat (>= 3.0.0)
Config/testthat/edition: 3
Remotes:  
    gitlab::my_gitlab_name

However, when I try to install the package by running this:

devtools::install()

I get the following error:

Error in utils::download.file(url, path, method = method, quiet = quiet,  : 
  cannot open URL 'https://gitlab.com/api/v4/projects/my_gitlab_name%2Fpackage1/repository/commits/HEAD'

FYI, I've also tried the following, with no success (I get the same error no matter what):

usethis::use_dev_package(package = "package1", type = "Imports", remote = "my_gitlab_name/package1")

usethis::use_dev_package(package = "package1", type = "Imports", remote = "my_gitlab_name")

usethis::use_dev_package(package = "package1", type = "Imports", remote = "my_gitlab_name/package1")

usethis::use_dev_package(package = "package1", type = "Imports", remote = "gitlab::my_gitlab_name/package1")

In short, I'd like to know how to add a gitlab developer library as an import for a package.

Does anyone know what I'm missing here? Your help would be much appreciated.

My apologies for not providing a reproducible example, the packages in question are both proprietary to my company.