Vault is not supposed to be altered. Just try to type it normally.
If that doesn't work for you.
Do you only have Souls in your vault code from before?
If before C(18)
- *Hotfix* Fixed a bug with the save/load system that prevent D(1) vault codes from being loaded in D(1); your old D(1) vault codes are useless; you need to save again in this version to get a "clean" save
- Due to significant changes in the vault, this version no longer supports vault codes without the collectible feature initialized
- To properly load vault codes from c(18), make sure you have at least one collectible in your vault archive!
If that is the case, only thing you could try is to gather people for a blackfire deep party and try to get a collectible. This is nowadays rather unlikely to happen