I don't know how technical you are but this is the regex we use 

```
export const B64_REGEX = /^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/
```

Can you dm the cert somewhere? You can also safely share it here as it's just the the public side, but I'll leave that up to you. I suspect there's a small formatting issue because an encoding with one `=` works for me. 

Depending on how you are copying it (e.g. double click), sometimes it won't copy the whole thing.

bzzzt

How many `=` are at the end of your cert?

k00b

SN release: NWC & LNBits for sending, LND for autowithdraw, NSFW labels, & more

based64 for the cert copied from the start9 properties page for my lnd node, using hex baked via thunderhub for the invoices macaroon ( not getting a validation error for macaroon, just thought info might be helpful).