git private Submodule checkout fails

currently trailing TeamCity to see if works for our workflow, stuggling to get it to checkout git projects with private git submodules (projects themselves are private and accessed with username/password and use same credentails for submodules), all source is stored on bitbucket and accessed over HTTPS. TeamCity is able to using the same VCS root checkout other projects without submodules just fine (so im happy credentails/proxy issues are not the issue).

the error returned is:

Failed to build patch for build #19 {build id=209, buildTypeId=CI_BC_123},
VCS root: "BitBucket VCS" {instance id=192, parent internal id=11, parent id=BITBUCKET_VCS, description: "https://bitbucket.org/team123/main-repo.git#"}, due to error: 'build patch' command failed.

stderr: Cannot fetch the 'https://username123@bitbucket.org/team123/sharedAsssetsRepo.git' repository used as a submodule at the 'repo/SharedAssets' path in the 'https://bitbucket.org/team123/main-repo.git' repository in the ba90b0c96170b1abf5af2322069662c7b541d908 commit

and the submodules as follows

[submodule "repo/SharedAssets"]
      path =repo/SharedAssets
      url = ../sharedAsssetsRepo.git
[submodule "repoB"]
      path = resouceB
      url = ../resourceB.git

TC v 9.0.4 (build 32407) using server checkout