When executing NWAdmin.exe -o DelegateAllTasks -currentUser DomainCurrentuser -newUser DomainNewUser -siteUrl "https://siteurl<https://siteurl>" -comments "" -sendNotification true, the following error might occurs:

<script type="text/javascript">RegisterSod("strings.js", "u002f_layoutsu002f15
u002f1033u002fstrings.js?rev=ku00252FSaOdWtcHDDvsbu00252FUFykOAu00253Du002
53DTAG0");</script>
<script type="text/javascript">RegisterSod("sp.res.resx", "u002f_layoutsu002f1
5u002f1033u002fsp.res.js?rev=MbB92HT8biYuFau00252B1vTMilAu00253Du00253DTAG0
");</script>
<script type="text/javascript">RegisterSod("sp.runtime.js", "u002f_layoutsu002
f15u002fsp.runtime.js?rev=zvYN9sLbPYKc6PnMy8BJSAu00253Du00253DTAG0");Register

Verify that the -siteUrl to make sure it's not a double URL.

For example:
Incorrect: 
-siteUrl "https://siteurl<https://siteurl>"

Correct:
-siteUrl "https://siteurl"