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I have 300 site collections i need to change the theme on. I know you do this by cog -> change look -> theme and then you choose the theme you require. I have seen /_api/thememanager/ApplyTheme API but I cannot seem to get this to work and also i do not want to send off each theme settings, the theme is already there and out of the box. any idea to do this in REST , I am using MS FLOW as my REST API engine.

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We can use PnP PowerShell to change theme for those site collections.

Set-PnPWebTheme

To get all site collections from the tenant, we can use the script below.

$cred = Get-Credential

Connect-PnPOnline "https://mytenant.sharepoint.com" -Credentials $cred
$SiteCollections = Get-PnPTenantSite
foreach ($SiteCollection in $SiteCollections)
{
   Connect-PnPOnline -Url $SiteCollection.Url -Credentials $cred

}

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