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Helper I
Helper I

Flow to create subsite with custom webtemplate


I have a custom webtemplate i have saved as wsp file and uploadet it to my site collection.

I can use that webtemplate just fine if i create a manuel subsite and its showing it under custom webtemplates like her


The CustomWebtemplateID is listed here image.png and i try to use this ID to create the site.


Her is the flow - When e new item is created then



If i change my WebTemplate to STS#0 then new modern page is created just fine, but if i use my TemplateID then i get error (Status Code: 400)



the error is here:


"status": 400,
"message": "<?xml version=\"1.0\" encoding=\"utf-8\"?><m:error xmlns:m=\"\"><m:code>-2147024809, System.ArgumentException</m:code><m:message xml:lang=\"da-DK\">The file or arguments are not valid for the web template '{6B125B90-3015-4813-8404-C0CB31B122AE}#VAB-Skabelon'.&#xD;\nParameter name: WebTemplate</m:message></m:error>\r\nclientRequestId: 07142bab-e822-4098-be1f-8454cce0ff58\r\nserviceRequestId: d97ca79e-90fd-0000-376a-a308dc61c756",
"errors": []
I hope i was clear and i hope someone can tell me why i get this error when custom template is work great manually.




Frequent Visitor

It’s seemed to be okay, but i have noticed that the single quotation at the front of the WebTemplate ID is missing. can you fix and try it again? Actually, I have got a similar situaltion with you. My issue was WebTemplaID value was wrong.  I hope it will help.

New Member

There is an apostrophe missing in WebTemplate value. Try put


with extra ' after :

Helper I
Helper I

Hello all, i'm facing a similar issue and i would appreciate your help. I'm trying to create a subsite based on a template (i would like to use the template that i have created with this ID --> 

{B01398ED-CC81-45A2-8813-70F908EECFE5}#New Bank Template) ), but i cannot seem to get it to work. So i tried to create a subsite from an existing template (STS#0) and again it shows the same error message. Please check below my code and advise. 

Screen Shot 2020-11-18 at 5.35.15 PM.pngScreen Shot 2020-11-18 at 5.36.32 PM.pngScreen Shot 2020-11-18 at 5.36.52 PM.pngScreen Shot 2020-11-18 at 5.37.01 PM.png

Missing commas?

You should separate every parameter with ",", in your case there is no comma after Description and WebTemplate.

Try it 🙂

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