Only as long as the e-vignette hasn’t been entered into the Slovenians toll system, changes can be made. Once the e-vignette has been activated the number plates can’t be changed.
If you entered the wrong license plate, please check your options here.
Related articles:
Can I get a refund if I buy the wrong Slovenian vignette?
Can I cancel my digital purchase of the Slovenian vignette?
Can I transfer my Slovenian e-vignette to another car?
Do I receive a refund, if I take my vehicle off the Slovenian roads and return the number plates?
Penalties for wrong vehicle details given (e.g. wrong toll class)