Login name should be sent in lower case to ISDS webservices
User of "mobilni datovka" can enter login name in upper case or mixed case. Username is then sent to ISDS's webservices as-is. But ISDS allows only lower-case login name. So login will not be allowed in that case.
All login names are lower-case in ISDS. We reccomend "mobile datovka" to do .toLowerCase() on login name entered by user. And "Datovka" as well.
This problem was found in ISDS logfiles with "mobilní Datovka-1.14.5" useragent.