I probably had one generated by WebGrab+Plus but since that app requires 1GB dependency of MonoDevelop I deleted that.But I can confirm that https://epg-polska.net/guide.xml entered in browser take long time to load...so maybe it is some timeout issue as channels is not available to get the data.
If there is a timeout issue it will say timeout in the logs.
My recent logs:
2020/04/13 23:38:20.941564 [IDX] Pruned 0 expired groups from XMLTV-CUSTOM in 334.539µs.
2020/04/13 23:38:20.942180 [IDX] Pruned 0 expired groups from X-TVE in 580.313µs.
2020/04/13 23:38:20.947726 [IDX] Pruned 0 expired airings from XMLTV-CUSTOM in 102.145µs.
2020/04/13 23:38:21.004008 [IDX] Pruned 34 expired airings from X-TVE in 56.233771ms.
2020/04/13 23:38:23.507340 [DVR] Waiting 21m36.492663s until next job 1586815200-11 Magnum, P.I.
2020/04/13 23:42:35.402815 [IDX] Pruned 0 expired groups from XMLTV-CUSTOM in 2.851409ms.
2020/04/13 23:42:35.402977 [IDX] Pruned 0 expired groups from X-TVE in 122.843µs.
2020/04/13 23:42:35.407672 [IDX] Pruned 0 expired airings from XMLTV-CUSTOM in 128.32µs.
2020/04/13 23:42:35.658710 [IDX] Pruned 1 expired airings from X-TVE in 250.951631ms.
2020/04/13 23:42:40.514289 [DVR] Waiting 17m19.485715s until next job 1586815200-11 Magnum, P.I.
2020/04/13 23:42:52.096970 [IDX] Pruned 0 expired groups from XMLTV-CUSTOM in 53.249µs.
2020/04/13 23:42:52.097218 [IDX] Pruned 0 expired groups from X-TVE in 179.178µs.
2020/04/13 23:42:52.099384 [IDX] Pruned 0 expired airings from XMLTV-CUSTOM in 58.818µs.
2020/04/13 23:42:52.099868 [IDX] Pruned 0 expired airings from X-TVE in 410.713µs.
2020/04/13 23:42:54.255962 [DVR] Waiting 17m5.744041s until next job 1586815200-11 Magnum, P.I.
Never heard that XML content protection is possible, but when I download that xml file from the site and put it on my server I cannot assign channels to numbers.I'm out of options.
Let's call it a day. I'm terrible sorry that I wasted so much of your time on Easter Monday, I appreciate patience.
Looks that Poland belong to authoritarian countries and government prevent us from watching TV non-standard way so it never work with Channels. Pity as I won't renew subscription. Have a nice afternoon 
This is crazy - I launched today CHannels client on Apple TV and the EPG data was there despite I cleared guide service on server...when I launched Channels Beta it was not there so I assume it's caching issue.
@tmm1 Aman,I found something that looks good epg source https://iptv.memorial/EPG.xml could you compare it with my logs?
2020/04/16 12:41:21.230919 [DVR] Fetched guide data for XMLTV-CUSTOM in 2s
2020/04/16 12:41:23.120826 [DVR] Indexed 0 airings (0 channels) [1s index]
2020/04/16 12:41:23.519146 [IDX] Pruned 0 expired groups from XMLTV-CUSTOM in 50.331µs.
2020/04/16 12:41:23.519732 [IDX] Pruned 0 expired groups from X-TVE in 557.093µs.
2020/04/16 12:41:23.530360 [IDX] Pruned 0 expired airings from XMLTV-CUSTOM in 80.16µs.
2020/04/16 12:41:23.560841 [IDX] Pruned 483 expired airings from X-TVE in 30.430756ms.
First,This is large guide data I don't believe it can be fetched in 2 seconds. Secondly that "0" number is not looking good.
Try updating your dvr
Only xmltv files with lcn tags are supported. Others are not working.
Not on server side true, but this is where you are wrong 
I restarted server yesterday, and today morning I see
@tmm1 I tried to load to channels from this file
I added by hand tags.
Got error in logs, tough:
2020/04/18 21:41:22.039044 [ERR] Failed to download xmltv: Get "/Users/sebastian/.xteve/data/xteve.xml": unsupported protocol scheme ""
why is that?
It needs http url
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I used here same result.
2020/04/19 10:56:34.203976 [IDX] Pruned 0 expired groups from XMLTV-CUSTOM in 3.102544ms.
2020/04/19 10:56:34.248397 [IDX] Pruned 0 expired groups from X-TVE in 44.375147ms.
2020/04/19 10:56:34.275968 [IDX] Pruned 0 expired airings from XMLTV-CUSTOM in 92.525µs.
However I cannot do proper channel mappings -
It looks like it still reads xml from here is there any way to clear it?