If PowerPoint Designer doesn't have any design ideas for you, there are a few possible reasons for that situation.
Turn on the Office intelligent services
To use PowerPoint Designer, make sure that Office intelligent services are turned on:
Go to File > Options and look for Office intelligent services on the General tab.
See Enabling and disabling intelligent services for more information.
Don't see any PowerPoint Designer suggestions?
If there are no Design Ideas available for you, a few things might be the cause. First of all:
Make sure you're connected to the Internet. PowerPoint Designer goes online to get its Design Ideas.
Have you upgraded from a specific version of Office to an Office 365 subscription? Reinstalling is necessary in order to see all the subscriber-only features. See Reinstall to get subscriber features below for details.
Use a theme that comes with PowerPoint (not a custom theme or one that you've downloaded from elsewhere).
Following are other things you can do to troubleshoot.
No design ideas for slides with pictures?
Make sure your slide has either the Title or Title + Content slide layout applied.
Don't use any additional objects or shapes on the same slide as your photo.
Use a maximum of four photos (.jpg, .png, .gif, or .bmp) per slide, and make sure they're larger than 200 x 200 pixels in size.
No design ideas for process-based slides?
Make sure your slide has the Title + Content slide layout applied.
Don't use any additional photos, objects, or shapes on the same slide as your process text.
Because PowerPoint Designer is a relatively new service, it is still learning new tricks. If Designer can’t generate high-quality options for you, it won’t show any options at all. We're working hard to be able to generate great design ideas for more varieties of your content.
And of course, if you don’t find Designer useful, you can turn it off by going to File > Options > General, and then clearing the box that says Automatically show me design ideas.
Someone else is editing
If you are co-authoring a presentation with someone else and more than one person is actively editing a single slide at one time, Designer won't give design suggestions on that slide.
However, as soon as there's only person editing the slide, Designer will begin offering design suggestions again once that person does an action (such as adding a photo) that Designer can respond to.
No design ideas for slides that have shapes or text boxes
PowerPoint Designer isn't able to suggest design ideas when a slide has a shape or text box drawn on it. You can have photos and you can have text in a placeholder.
An administrator may have turned off PowerPoint Designer
PowerPoint Designer is a feature for Office 365 subscribers, but some organizations turn off the feature. If you have an Office 365 subscription but don't see PowerPoint Designer, ask your IT department.
Reinstall to get subscriber features
If you've upgraded from Office to an Office 365 subscription, you need to uninstall Office and then reinstall in order to get the subscriber features. See the instructions in these articles: