Failed to save add-on configuration

[GrumpyBusted]

I am trying to configure the integration using the add-on, but I get an error when saving the configuration.

Error message:
Failed to save add-on configuration, not a valid value.

My configuration;
updateInterval: 300
babelLocale: da_DK
TZ: Europe/Copenhagen
debug: false
disable_logging: false
mqtt:
broker: 192.168.0.17
port: 1883
username: mosquitto
password: XXXXX
volvoData:
username: [email protected]
password: XXXXXX
vin:
- YV12ZEL93Rnnnnnnn
- YV1XZEHR4Rnnnnnnn
vccapikey:
- xxxx9d1b84ee4bffaebeea2b2fedxxxx
- xxxx3a638bbc4780a22be0c5ec86xxxx

I found that if I change the port to a string "1883" and remove the VINs then I can save the configuration.