Angular <mat-expansion-panel-header> does not expand - angular-material

Question

I am learning Angular and using Material for Angular for styling. For some reason the mat-accordian isn't working for me.
<mat-accordion>
<mat-expansion-panel >
<mat-expansion-panel-header>
<mat-panel-title>
<h2>Post 1</h2>
</mat-panel-title>
<mat-panel-description>
<p>Post 1 Content</p>
</mat-panel-description>
</mat-expansion-panel-header>
<p>I'm in an expansion panel</p>
</mat-expansion-panel>
</mat-accordion>
import { NgModule } from '#angular/core';
import { BrowserAnimationsModule } from '#angular/platform-browser/animations';
import { BrowserModule } from '#angular/platform-browser';
import {
MatInputModule,
MatCardModule,
MatButtonModule,
MatToolbarModule,
MatExpansionModule
} from '#angular/material/';
import { AppComponent } from './app.component';
import { FormsModule } from '#angular/forms';
import { PostCreateComponent } from './posts/post-create/post-create.component';
import { HeaderComponent } from './header/header.component';
import { PostListComponent } from './posts/post-create/post-list/post-list.component';
#NgModule({
declarations: [
AppComponent,
PostCreateComponent,
HeaderComponent,
PostListComponent,
],
imports: [
BrowserModule,
BrowserAnimationsModule,
FormsModule,
MatInputModule,
MatCardModule,
MatButtonModule,
MatToolbarModule,
MatExpansionModule
],
providers: [],
bootstrap: [AppComponent]
})
export class AppModule { }
"dependencies": {
"#angular/animations": "^14.2.0",
"#angular/common": "^14.2.0",
"#angular/compiler": "^14.2.0",
"#angular/core": "^14.2.0",
"#angular/forms": "^14.2.0",
"#angular/material": "^7.0.0",
"#angular/cdk": "^7.0.0",
"#angular/platform-browser": "^14.2.0",
"#angular/platform-browser-dynamic": "^14.2.0",
"#angular/router": "^14.2.0",
"rxjs": "~7.5.0",
"tslib": "^2.3.0",
"zone.js": "~0.11.4"
I've tried reading other posts on stack overflow but nothing has seemed to work.
I tried installing with
import {MatExpansionModule} from '#angular/material/expansion';
but this doesn't work. The accordion is just forever open. Does anyone with Angular experience know where I am going wrong?

Answer 1

Solved: If you install using the default installation and there are peer dependencies it will install an earlier version of Angular Material.
To Fix the issue I uninstalled Angular globally, cleared the cache, then reinstalled, and was able to resolve the dependency conflicts and install the latest version.