Getting Id 0 when storing a Model using all possible methods.

I am getting id 0 when storing a Model using ->create() , ->save() and even when using it in the created event. It returns the correct id when creating one from Tinker and it also saves in database but when I use $calender->id it returns 0.

Schema::create('calendars', function (Blueprint $table) { $table->id(); $table->string("start"); $table->string("end"); $table->foreignId("learner_id")->constrained()->cascadeOnDelete(); $table->foreignId("driving_instructor_id")->nullable()->constrained()->cascadeOnDelete(); $table->foreignId("event_type_id")->constrained()->cascadeOnDelete(); $table->foreignId("licence_class_id")->constrained()->cascadeOnDelete(); $table->text("description")->nullable(); $table->timestamps(); });

class Calendar extends Model { use SoftDeletes;

protected $fillable = [
    "start",
    "end",
    "learner_id",
    "driving_instructor_id",
    "event_type_id",
    "licence_class_id",
    "description",
];

protected $appends = ["title"];

public function eventType()
{
    return $this->belongsTo(EventType::class);
}

public function learner()
{
    return $this->belongsTo(Learner::class);
}
public function transaction()
{
    return $this->hasOne(Transaction::class);
}

public function drivingInstructor()
{
    return $this->belongsTo(DrivingInstructor::class);
}

public function licenceClass()
{
    return $this->belongsTo(LicenceClass::class);
}

public function getTitleAttribute()
{
    return $this->learner->full_name;
}

}

When use the create method, it successfully creates a new entry in the database however it is returning and id 0.

dd(Calendar::create($data)->id);

The $data variable holds:

[ "title" => "" "start" => "2020-11-30T23:00:00.000Z" "startTimezone" => "" "end" => "2020-11-30T23:00:00.000Z" "endTimezone" => "" "recurrenceRule" => "" "recurrenceException" => "" "isAllDay" => true "description" => "" "driving_instructor_id" => 3 "event_type_id" => 1 "licence_class_id" => 1 ]

I have never faced this issue before. When i do the same thing with tinker however it returns the correct id. I have tried using the $calendar->save() method as well and it is returning id as 0 as well. Any help would be appreciated.