LNbits complains "invalid lnurl 400" while @lntxbot gets an invoice

[HamishMacEwan]

Request to pay iceland@merak-4.BitID.nz (valid according to https://lightningdecoder.com/iceland@merak-4.BitID.nz) from LNbits.com (and local instance) responds with

invalid lnurl
400

The satdressoutput is:

<nil> INF got lnurl request username=iceland
<nil> DBG {iceland lnbits https://lnbits.net/ [KEY]  }

The LNURLp data returned from:

https://merak-4.bitid.nz/.well-known/lnurlp/iceland
is:

{"status":"OK","callback":"https://merak-4.BitID.nz/.well-known/lnurlp/iceland","tag":"payRequest","maxSendable":100000000,"minSendable":1000,"metadata":"[[\"text/identifier\",\"iceland@merak-4.BitID.nz\"],[\"text/plain\",\"Satoshis to iceland@merak-4.BitID.nz."]]","commentAllowed":0}

Meanwhile
/send 1337 mynodebtc@merak-4.BitID.nz

has this satdress output (but there is no route to settle payment of invoice)

<nil> INF got lnurl request username=iceland
<nil> DBG generating invoice backend={"Cert":"","Host":"https://lnbits.net/","Key":"[KEY]"} description_hash=b0624c1bbcad92bc3d9ac9820a05b869b6a7c93af52d6b31e0779c92a5903e08 msatoshi=1337000